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<br />EXHIBIT J (Cont'd) <br />are not growing very well. Their age is unknown. <br />Successional Communities. <br />As a consequence of cultivation at different times in <br />J different areas, several stages of old field succession can be <br />found on the site. However, the successional patterns are <br />not necessarily sequentially related, but show clear differ- <br />1 ences depending upon the amount of grazing that occurs and the <br />chemistry of the soil. <br />A. Bromus dominated group - This group, which is strongly <br />_ dominated by a Bromegrass, occurs on both the Arvada loam and <br />the Heldt clay loam. Under the influence of cultivation, <br />these soils are hardly distinguishable by the vegetation. <br />Both exhibit varying densities depending upon the amount of <br />grazing. The great difference in the nature of these <br />soils is not exhibited in the vegetation. <br />Other species found along with the Bromegrass include <br />Grindellia squarosa (Gumweed), Distichlis stricta (Desert Salt- <br />grass), and Agropyron elongatum (Tall Wheatgrass). Generally, <br />these other species exhibit a great local abundance in tiny, <br />widely-spaced areas. <br />Cover is highly variable. Where the area is temporarily <br />protected from grazing, the cover approaches an average of about <br />75 percent, but where grazing is very intense, cover can <br />decline to less than 20 percent over fairly large areas. <br />B. Distichlis - Sporobolus - Atriplex group - This succes- <br />sional group is found in areas of widely varying disturbance. <br />Where the disturbance is rather young, the vegetation is <br />-41- <br />